<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    const obj = {
      uname: 'pink',
      age: 18,
      hobby: ['乒乓球', '足球'],
      family: {
        baby: '小pink'
      }
    }
    //转化为字符串，利用字符串的不可变性
    console.log(JSON.stringify(obj));
    const newObj = JSON.parse(JSON.stringify(obj))
    newObj.uname = '老王'
    console.log(newObj);
    console.log(obj);
  </script>
</body>

</html>